Climate Control Series
Quincy Compressor
2022209100, August 2018
33
Trouble
Probable Cause
Compressor overheats
•Clogged intake system
•Defective compressor valves
•Pressure setting too high
•Clogged intercooler, internally or exter nally
•Pulley/sheave rotation wrong
•Incorrect speed
•Running clearances insufficient
(piston to cylinder wall or running gear)
•Lubrication inadequate
•Compressor incorrectly sized
High discharge
•Inadequate cooling water flow
temperature
•Compressor valve assemblies defective
•Discharge pressure too high
•Inadequate ventilation or hot air recirculat ing
•Cooling surfaces of compressor or inter cooler excessively dirty
•Internal surface of heat exchanger fouled
•Ambient temperature too high
•Scored or excessively worn cylinder walls
Compressor knocks
•Head clearance insufficient
•Piston loose in cylinder bore, cylinder bore worn, piston or piston rings
worn
•Worn rods or main bearing
•Wrong pressure setting, discharge pressure excessive
•Crankcase lubrication inadequate
•Loose pulley/sheave
•Compressor valve assemblies loose
•Loose/defective belt
Excessive lubricant
•Worn piston rings
consumption
•Restricted intake system
•Compressor running too hot
•Breather valve not functioning properly
•Lubricant level in crankcase too high
•Lubricant viscosity wrong for the application
•Connecting rod out of alignment, bent or twisted
•Leaking oil seal
•Piston rings not seated
•Wrong lubricant
(may be a detergent lubricant with a tendency to foam)
•Inferior grade of lubricant
